造纸专业英语7

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1、Lesson16DryandwetstrengthadditivesAnumberofnaturalandsyntheticpolymericsubstancesmaybeadmixedwiththestockatthewetendtoimprovethephysicalpropertiesofthedrysheet.Theiractionistoreinforcefiber-to-fiberbondsandtherebyimprovetheburstandtensilestrength,providegreaterresistancetoerasu

2、re,reduce“fuzz”orlintonthepapersurface,reducetherateofwaterpenetration.additive添加剂synthetic合成的polymeric聚合物的stock坯料，材料，原料bond键burst耐破度tensilestrength抗张强度fuzz细毛,绒毛lint棉绒penetration浸透erasure抹掉，消除Lesson16DryandwetstrengthadditivesThetraditionalinternalstrengthadditivesarenaturaland

3、modifiedstarchesandgums.Bothareusuallycookedatlowconcentrationpriortousetopromoteswellinganddispersion.Thetrendtodayistowardincreaseduseofsuchsyntheticpolymersaslatexesandpolyacrylamideseitheraloneorincombinationwithstarchesandgums.starch淀粉gum树胶concentration浓度swell润胀dispersion分

4、散latex胶乳polyacrylamide聚丙烯酰胺acryl丙烯（醛基）Lesson16Dryandwetstrengthadditivesresin树脂Theactionofwet-strengthresinsistotiefibersandfinestogetherwithadditionalbondsthatarenottakenapartbywater.Wet-strengthpaperisdefinedassuchifitretainsmorethan15%ofitstensilestrengthwhenwet.Lesson16Drya

5、ndwetstrengthadditivesagent药剂urea尿素formaldehyde甲醛melamine三聚氰胺polyamide聚酰胺water-soluble水溶性的anionic阴离子的cationic阳离子的degreeofpolymerization聚合度cure熟化，固化Themostcommonwet-strengthagentsareurea-formaldehyde,melamine-formaldehyde,andpolyamideresins;theyarewater-solubleandavailableinboth

6、anionicandcationicforms.Theseagentsareappliedatanintermediatedegreeofpolymerization,sothatthefinal“cure”isobtainedinthedryers.Lesson17InternalsizingandalkalinepapermakingThepurposeofsizingistoenablepaperproductstoresistpenetrationbyfluids.Sizingcanbeachievedeitherbyusingwet-end

7、additives(“internalsizing”)orbyapplyingasuitablecoatingtothesurfaceofthedriedpaper(“surfacesizing”).Internalsizingisaccomplishedbyaddingmaterialstothestockbeforetheheadboxtoretardwaterpenetrationintothefinalpaper.sizen.胶料v.上胶sizing上胶，施胶coatv.外面覆盖fluid流体headbox流浆箱Lesson17Interna

8、lsizingandalkalinepapermakingWaterpenetrationisretarde